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  <title>用给定角度旋转图像</title>
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  <div id="layout-content"><div id="function.imagerotate" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imagerotate</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagerotate</span> &mdash; <span class="dc-title">用给定角度旋转图像</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imagerotate-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imagerotate</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
   , <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$bgd_color</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$ignore_transparent</code><span class="initializer"> = 0</span></span>
  ] ) : <span class="type">resource</span></div>

  <p class="para rdfs-comment">
   将 <code class="parameter">src_im</code> 图像用给定的
   <code class="parameter">angle</code> 角度旋转。<code class="parameter">bgd_color</code>
   指定了旋转后没有覆盖到的部分的颜色。
  </p>
  <p class="para">
   旋转的中心是图像的中心，旋转后的图像会按比例缩小以适合目标图像的大小——边缘不会被剪去。
  </p>
  <p class="para">
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imagerotate-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    <dt>
<code class="parameter">image</code></dt>

<dd>
<p class="para">由图象创建函数(例如<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>

    
     <dt>
<code class="parameter">angle</code></dt>

     <dd>

      <p class="para">
       Rotation angle, in degrees. The rotation angle is interpreted as the
       number of degrees to rotate the image anticlockwise.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">bgd_color</code></dt>

     <dd>

      <p class="para">
       Specifies the color of the uncovered zone after the rotation
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">ignore_transparent</code></dt>

     <dd>

      <p class="para">
       如果被设为非零值，则透明色会被忽略（否则会被保留）。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imagerotate-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回旋转后的图像资源，
    或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>

 <div class="refsect1 changelog" id="refsect1-function.imagerotate-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.1.0</td>
       <td>
        新增： <code class="parameter">ignore_transparent</code> 。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imagerotate-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3734">
    <p><strong>Example #1 将图像旋转 180 度</strong></p>
    <div class="example-contents"><p>
     本例将把一幅图像旋转 180 度——上下颠倒。
    </p></div>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;File&nbsp;and&nbsp;rotation<br /></span><span style="color: #0000BB">$filename&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'test.jpg'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$degrees&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">180</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;Content&nbsp;type<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type:&nbsp;image/jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Load<br /></span><span style="color: #0000BB">$source&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Rotate<br /></span><span style="color: #0000BB">$rotate&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagerotate</span><span style="color: #007700">(</span><span style="color: #0000BB">$source</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$degrees</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Output<br /></span><span style="color: #0000BB">imagejpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$rotate</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/21009b70229598c6a80eef8b45bf282b-imagerotate.jpg" alt="例子的输出：将图像旋转 180 度" width="95" height="51" />
     </div>
    </div>
   </div>
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.imagerotate-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数仅在与 GD 库捆绑编译的 PHP 版本中可用。</span></p></blockquote>
 </div>

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